Vintage Synth Repair

From: "paul.rak@... [vintagesynthrepair]" <vintagesynthrepair@yahoogroups.com>
To: vintagesynthrepair@yahoogroups.com
Sent: Tuesday, March 15, 2016 4:30:27 PM
Subject: [vintagesynthrepair] Korg Delta Advice Needed


 












Hi.


I just bought a Korg Delta as a project.


It has a few issues.. 


1. None of the A# keys work - Assuming this is Top Octave Chip?


2. Zero output on LP filter - replace orange caps & chips (kit on ebay)?


3. Resonance control has no effect - fixed by solution to (2)?


4. Broken headphones output - new socket?


5. Cosmetic issues inc broken slider, missing slider caps etc








Apart from this, it works! I got it for a song, under the understanding that I wasn't going to break it up.. I'm not.








Any advice gratefully accepted.. this is my second attempt at posting this message...


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I just took a quick look at Ebay and saw that there are several Delta-specific replacement parts for sale. As for tracking down the specific locations of the problems, I recommend direct and simple troubleshooting. If you have an amplifier or ghetto blaster, you can use that as a signal tracer and follow the signal path to the point where it stops working. P ossibly right to a bad component, broken wire, or soldering problem (hey, it happens) . Never underestimate the value of a close visual inspection. You could  check the outputs of the top octave chip, might find it is a bad divider chip. That narrows it down quite a bit and doesn't require waiting for people to make guesses over the internet.  I also just did a quick Google search and I found and downloaded a Delta service manual for free. S o if you don't already have one, I recommend getting it. I f you want to fix it yourself, it could take hours . In my experience, if you get help online it can take weeks and usually some extra bucks spent replacing perfectly good parts (such as the often recommended  "recapping").  Or months if you get  professional help.